DTC 43

43 VARIABLE EFFORT STEERING (VES) STEERING WHEEL SENSOR CKT MALFUNCTION

DTC 43 VES Steering Wheel Sensor Circuit Fault (For ABS With VES Only) (Part 1 Of 3):

DTC 43 VES Steering Wheel Sensor Circuit Fault (For ABS With VES Only) (Part 2 Of 3):

DTC 43 VES Steering Wheel Sensor Circuit Fault (For ABS With VES Only) (Part 3 Of 3):

DTC 43 VES Steering Wheel Sensor Circuit Malfunction (For ABS With VES Only):

Circuit Description:
The EBCM supplies a 5 volt reference signal to the steering wheel speed sensor through EBCM connector "C1", terminal "A12" to sensor connector terminal "A." Steering wheel position input to the EBCM is provided through steering wheel speed sensor connector terminal "B" to EBCM connector "C1", terminal "B8." Terminal "C" of the steering wheel speed sensor provides ground through EBCM connector "C1", terminal "A8".

DTC Will Set When:
DTC 43 can set anytime. A malfunction exists if the steering wheel speed sensor voltage is less than 0.5 volts, greater than 4.7 volts or changes by more than 2 volts in 5 msec.

Action Taken:
A malfunction DTC is stored, Variable Effort Steering (VES) is disabled and power steering returns to full assist.

DTC Chart Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Checks steering wheel speed sensor input to the EBCM.
2. Checks for a short between the steering wheel speed sensor input and ground circuits.
3. Checks for a short between the steering wheel speed sensor 5V reference signal and ground circuits.
4. Checks for a short to ground in the steering wheel speed sensor input circuit.
5. Checks for a short to ground in the steering wheel speed sensor 5V reference signal circuit.
6. Checks for high resistance in the steering wheel speed sensor 5V reference signal circuit.
7. Checks for high resistance in the steering wheel speed sensor input circuit.
8. Checks for poor terminal contact.
9. Checks for proper voltage output of the EBCM.
10. Ensures malfunction was not due to physical damage of the steering wheel speed sensor circuits.
11. Checks for proper voltage with the steering wheel speed sensor disconnected.
12. Checks for high resistance in the steering wheel speed sensor ground.
13. Isolates high resistance to the EBCM or the ground circuit.
14. Ensures open ground was not due to a short to voltage.
15. Ensures malfunction was not due to circuit damage or poor terminal contact.
16. Checks for a short to voltage in the steering wheel speed sensor circuit.
17. Ensures malfunction was not due to physical damage of the circuitry.
18. Checks for proper voltage with the steering wheel speed sensor connected.
19. Checks for proper voltage with the steering wheel speed sensor disconnected.
20. Checks for a short between the steering wheel speed sensor 5V reference signal and ground circuits.
21. Ensures malfunction was not due to physical damage of the circuitry.
22. Checks for a short between the steering wheel speed sensor 5V reference signal and input circuits.
23. Checks for proper resistance of the steering wheel speed sensor.
24. Ensures malfunction was not due to physical damage of the circuits.
25. Checks for an open resistor in the steering wheel speed sensor.

Diagnostic Aids:
An "Intermittent" malfunction is most likely caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation.

The frequency of the malfunction can be checked by using the enhanced diagnostic function of the Tech 1.

Any circuitry that is suspected of causing the intermittent complaint should be thoroughly checked for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wiring connections or physical damage to the wiring harness.